Electro-optical characteristics of dye-doped polymer dispersed liquid crystals

Kee-Jeong Yang; Do-Young Yoon

Journal of Industrial and Engineering Chemistry, Vol.17, No.3, 543-548, May, 2011

DOI10.1016/j.jiec.2010.12.018 Export Citation

Electro-optical characteristics of dye-doped polymer dispersed liquid crystals

Kee-Jeong Yang, and Do-Young Yoon^†

Department of Chemical Engineering, Kwangwoon University, Seoul 139-701, Republic of Korea

E-mail:

The electro-optical properties of dye-doped Polymer Dispersed Liquid Crystal (PDLC) films were examined as a function of the polymer UV curing temperature, injection temperature and applied voltage. In addition, the effects of the morphology on the electro-optical properties were examined. The contrast ratio and driving voltage of the PDLC films were affected considerably by changes in the UV curing temperature but the injection temperature had a much lesser effect. The color difference and electro-optic characteristics of the dye doped PDLC film were investigated, where the PDLC films were doped with RGB dyes for flexible display applications. The red-dye-doped PDLC film with small-sized particles showed good color differences. In this dye-doped PDLC system, the film driving voltage (Von) of the PDLC increased with increasing liquid crystal droplet size, except for the TL205-prepolymer-red dye. In particular, the red-dye doped PDLC composition showed the lowest Von in the electro-optic characteristics of the dye-doped PDLC film.

Keywords:Dye-doped polymer dispersed liquid crystal;Electro-optical property;Color difference;Driving voltage;Morphology

[References]

Bouteiller L, Barny PL, Liq. Cryst., 21, 157 (1996)
Spruce G, Pringle RD, Electr. Commun. Eng. J., 4, 91 (1992)
Doane JW, West JL, Golemme A, Whitehead JB Jr., Wu BG, Mol. Cryst. Liq.Cryst., 165, 511 (1988)
Crawford GP, S. Zumer, Liquid Crystals in Complex Geometries, Taylor & Francis, London (1996)
Armitage D, Underwood I, Wu ST, Introduction to Microdisplays, Wiley, Chichester, UK (2006)
Crawford GP, Flexible Flat Panel Displays, Wiley, Chichester, UK (2005)
Drzaic PS, Liquid Crystal Dispersions, World Scientific Publishing, Singapore (1995)
Yang DK, Wu ST, Fundamentals of Liquid Crystal devices, Wiley, Chichester, UK (2006)
Lueder E, Liquid Crystal Displays, Wiley, Chichester, UK (2001)
Mucha M, Prog. Polym. Sci., 28, 837 (2003)
Amundson K, Phys. Rev. E., 53, 2412 (1996)
de Gennes PG, Prost J, The Physics of Liquid Crystals, Oxford University Press, New York (1993)
Kyu NB, Kim KH, Kim KS, Kim WY, Kim HD, Kwon SB, Bae BS, Song YK, Yang BK, Yeo JK, Lee DS, Lee SH, Lee SS, Lee JC, Yoo JT, Jung YC, Cho SI, Han JI, LCD Engineering, Sungandang, Seoul (2000)

[Referenced By]

[Related Articles]

[1] Bouteiller L, Barny PL, Liq. Cryst., 21, 157 (1996)

[2] Spruce G, Pringle RD, Electr. Commun. Eng. J., 4, 91 (1992)

[3] Doane JW, West JL, Golemme A, Whitehead JB Jr., Wu BG, Mol. Cryst. Liq.Cryst., 165, 511 (1988)

[4] Crawford GP, S. Zumer, Liquid Crystals in Complex Geometries, Taylor & Francis, London (1996)

[5] Armitage D, Underwood I, Wu ST, Introduction to Microdisplays, Wiley, Chichester, UK (2006)

[6] Crawford GP, Flexible Flat Panel Displays, Wiley, Chichester, UK (2005)

[7] Drzaic PS, Liquid Crystal Dispersions, World Scientific Publishing, Singapore (1995)

[8] Yang DK, Wu ST, Fundamentals of Liquid Crystal devices, Wiley, Chichester, UK (2006)

[9] Lueder E, Liquid Crystal Displays, Wiley, Chichester, UK (2001)

[10] Mucha M, Prog. Polym. Sci., 28, 837 (2003)

[11] Amundson K, Phys. Rev. E., 53, 2412 (1996)

[12] de Gennes PG, Prost J, The Physics of Liquid Crystals, Oxford University Press, New York (1993)

[13] Kyu NB, Kim KH, Kim KS, Kim WY, Kim HD, Kwon SB, Bae BS, Song YK, Yang BK, Yeo JK, Lee DS, Lee SH, Lee SS, Lee JC, Yoo JT, Jung YC, Cho SI, Han JI, LCD Engineering, Sungandang, Seoul (2000)